The phrase "haddest alibi" suggests a situation where someone has an excuse or explanation to prove their innocence in a crime. Antonyms for "haddest alibi" would be words or phrases that imply guilt, responsibility or lack of defense. Examples of antonyms could include, but are not limited to, "incriminated," "suspected," "culpable," "blamed," "accused," "liable," "responsible," "guilty," "defendant," or "without excuse." These antonyms imply that the accused party has no evidence to support their innocence or that they are at fault for the crime. It is important to note that while antonyms for "haddest alibi" suggest a lack of innocence or defense, they do not necessarily mean that the accused party is guilty.